Tilting-chair.



9 9 m 5-, B D d e .t n B t a P N E E M TILTING CHAIR.

(Application filed Oct.'11, 1899.)

(No Model.)

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MICHAEL EVEN, OF PORT WASHINGTON, WISCONSIN.

TILTINGCHAIR.

SPECIFICATION forming part of Letters Patent No. 638,224, dated December5, 1899.

Original application filed July 5 1899, Serial No. 722,809. Divided andthis application filed October 11, 1899. Serial No. 733,275- (No model.)

To ctZZ whom it may concern:

Be it known that I, MICHAEL EVEN, a citi-' zen of the United States,residing at Port Washington, in the county of Ozaukee and State ofWiseonsin,have invented certain new and useful Improvements inTilting-Chairs, of which the following is a specification, referencebeing had to the accompanying drawings, forming a part thereof.

This application is a division of application Serial No. 722,809, filed.July 5, 1899.

The main object of my invention is to improve the construction andoperation of devices of this class.

It consists in certain novel features in the construction andarrangement of parts, as hereinafter particularly described, and pointed out in the claims.

In the accompanying drawings like letters designate the same parts inthe several figures.

Figure 1 is a vertical longitudinal section on the line 1 1, Fig. 2, oftilting-chair irons embodying my improvements. Fig. 2 is a horizontalsection on the line 2 2, Fig. 2; and Fig. 3 is a vertical longitudinalsection on the line 3 3, Fig. 1.

A is a head mounted on the upper end of the revolving spindle B orotherwise connected with a chair-base. (Not shown.) It is formed orprovided with upturned arms a a.

O is a spider or frame to which the chairseat (not shown) is attached inthe usual or any suitable way. It is formed or provided with dependingears 0 c, which are fitted over and are pivotally connected with thearms a a near their lower ends by a bolt or pin D, passing horizontallythrough them crosswise of said spider or frame A.

E is a bolt loosely engaging at its head with a depending forked orslotted arm don the under side of the spider C and extendinghorizontally forward therefrom above and transversely to the pivot pinor bolt D. It is threaded at its front end and provided with a nut e.

F F are spiral springs arranged on opposite sides of and parallel withthe bolt E between perforated bearing-plates G G, against which saidsprings are seated at their ends and through which the bolt E looselypasses. The nut e' bears against the outer or front plate G, and theinner or back plate G is provided at itsends with pivots g g, which haveseats or bearings on the arms Ct a of the head A. These pivots g g arepreferably odset, so that when the spider O is tilted with thechair-seat the spring-seats on the front face of the plate G, with therear ends of the springs F F, will move up and down as said plat-e rocksupon its pivot-bearings in conformity with the upand-down movement ofthe bolt E produced by the tilting of the chair-seat and spider C.Strains which tend to break, twist, or bend said bolt or springs arethus avoided, and the parts are caused to work freely without bindingwhen the spider is tilted backward and. forward. Y The pivots g 9 may belocated, as shown in the drawings, to the rear of the spring-seats onthe plate G, or they may be placed in advance of said seats. In eithercase the spring-seats will move up and down with the bolt E and keep thesprings F approximately parallel with said bolt, as above explained.

The arms a a, project upwardly underneath and close to overhangingflanges or parts of the spider O and are extended at their upper endshorizontally from front to rear, so that by engagement with the spiderthey will serve When the chair-seat, with the spider O, is

tilted backward, the arm 0 will be moved rearwardly away from the plateG', thereby drawing the bolt E endwise through said plate, which is heldby the head A in a relatively stationary position. This endwise movementof the bolt,whioh carries the front plate G backward with it, compressesthe springs F F, which offer a gradually-increasing resistance to thebackward movement of the chair-seat. The tension of said springs isadjusted as desired by means of the nut e. The overhanging flanges orparts of the spider O, engaging with the front and rear corners of thearms a a, limit the backward and forward movement of the chair-seat atthe desired points.

Various modifications in the minor details of construction may be madewithout departing from the principles and intended scope of myinvention.

I claim 1. The combination with a head having upturned arms, of a framehaving depending ears pivoted to said head and provided between saidears with a downwardly-projecting arm, a bolt engaged at one end withsaid arm and provided at the opposite end with a nut, two perforatedplates through which said bolt passes, one of said plates beingpivotally supported against the'arms of said head and the other bearingagainst said nut, and a spring interposed between said plates,substantially as and for the purposes set forth.

2. The combination with a head having upturned arms, of a frame havingdepending ears pivoted to said arms and provided between said ears witha downwardly-projecting arm, a bolt engaged at one end with said arm andprovided at the other end with a nut, two perforated bearing-plates,through which said bolt passes, having spring-seats on their opposingfaces, one of said plates having offset pivots bearing against the armson said head, and spiral springs interposed between and bearing at theirends against said plates on opposite sides of and approximately parallelwith said bolt, substantially as and for the purposes set forth.

3. The combination with a head having upturned arms, of a frame havingdepending ears pivoted to said arms which are horizontally extended attheir upper ends underneath overhanging portions of said frame andconstitute therewith stops for limiting the tilting movement of saidframe, and a spring opposing the backward movement of said frame,substantially as and for the purposes set forth. v

In witness whereof I hereto aflix my signature in presence of twowitnesses.

MICHAEL EVEN.

Witnesses:

CHAS. L. Goss, ELINOR V. WRIGHT.

